Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'af28c6b0d98d64574fc0c07dc04d8c4a188f90401daef2e3061a9c1973ddcce0' 
  AND token = 'PWA779HHmaOPKAtVohdVrffKqq/2hicAAokUd82+5VY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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