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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '24a351784a97b5f588917f521d0e82a2a179c07727fc43236d3faefc19b84742' 
  AND token = 'dJOC8FabvKdpQylIOgWBCwA8P5BCRFdteX6y3SPJo4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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