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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad29f76602d6c00b0bbedeab3cc4fa314aed1d66632fa2f25ccc2868967e869d' 
  AND token = 'Z9I5Tef5yNobFSDwosmkB8cm4V/sspUaOErQ390gSFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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