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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f1eca4e437c01eac3aee453cdc02698724542497715612e6bc34b35029efaa36' 
  AND token = '6VoQTfrWEoI3+rwc4ySgXOVVRL5HazkHrQIFn5aBFeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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