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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5a6b63996832dc57cf50781c54313689e3d569f1ca8970e152e5079a7aae7fcb' 
  AND token = 'vC8ZGBXRRTJNpeRqpKk2h8q0ntX9NfAipC0yfEbuEkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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