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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'afb515e90ea7e2d57f1c8faa6f07ad8a6326735c07aed2a083b3cf1789722fba' 
  AND token = 'VWEQgZKa5OOddL3umwTUEEJ2GRUWZiJzFXyYhjUMEF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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