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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '18d5e58d829f34bc0f7d8a86ef0e8abb4db3221ae58d2d8f684cd147629d4ace' 
  AND token = 'uKvuoLMyfK3oAAmGkyNTfgkq62zrDus/joxs3B1Jbao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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