SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ab0f0d0ae8f429342c6612a4ef6ffbb3bab58cc5dcc2984efe64ab7be024f773' 
  AND token = 'qPC7wLV+emkQqZjIGrhjk06K3Robzq8M+MMA57cUQtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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