SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '56c922f027217857c7a08e5ebdca29d8b5be773865536776f9053fa443452b58' 
  AND token = '2p0K+hmnsx/Mx3EQN41zYPGMxVOws/sJxjWwKXK7IRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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