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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '56080bbe3cf700cd3918efa9222493f8400f0ea4cd089436026cc3dc8c9843d7' 
  AND token = 'pmQ5NKUeD4FCSY4HXOT3L8gbrv09TpKs1xBi+unCJc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}