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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bc8e3807b61a45883571e092d08e098de33d7f31f294881cca669a1d41fa7cd3' 
  AND token = '0keD//0eMuIAa8zsMYMalDyKgljS7ZAlt0WNjitbMD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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