Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e021e14226111a6e286b2aa0723402da6c68d6c970c0f3bb1851ff321dab042a' 
  AND token = '6+vz8zgpuVvrx6O6tFATkSgXfaMik7n6P1jdzKxqFAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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