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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd77dfc47ea2b47e25bdaff61172d52ef22f7a957d658bd49d81aa667ea26d81e' 
  AND token = 'WRDmZUb3gTrtB/e4L7hOn7SolOIzrrL5unnUnNp0Se4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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