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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '673c2da685e0359c20c7cbca1baef982eeb4fcdce5d74589ecebb7a911d58d2b' 
  AND token = 'cEBxefyF0bcy5K4r8nkh+WWyt/W0UgUd2SuXLl7Ymus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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