SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e5fb2025051d06997d3d266d01e9e928f6bcfb346035c249ebbc40bf35fd0f7c' 
  AND token = 'aMJeRMwPgFLXqr+42ViruMR/QflVskhqzhZ01HS0DDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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