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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0665f49ed6057a91e17f1c504aee17d4bc97dc20cdeed8c3bd4d467f25e97640' 
  AND token = 'kyW93mwkwo7zI5iMX84ihV1iqdwL7EjCTNz3AX4YDdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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