Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b4ca19a1645412f640a9a262a0662a778f0d44a1e26d4c8920382e8f97bb0985' 
  AND token = 'F4vgT7HAT4wCiewfTGL7p/vaEpBQnVRDUSK1F1tibZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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