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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '265699f42613b042c1aafcc32804be171196402a45124d1852b84bc6ac4c09f4' 
  AND token = '9AEE6rN8rFY18FimPU0NxhzWd8Jqo5TyFeT1m3MnVZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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