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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e1ab0d905f8cde1eb7bdee185c4661d0715fd7b645862baebef32818a3c09362' 
  AND token = 'oOAaIWonS1VSneuFqjmhs9Aky7HKWQ2pFeabNzFU2jQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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