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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f41e837595e28ea3f1180221197a6f45297b133b3ce8f06f0d08685076f2f8cf' 
  AND token = 'd2nxmmFuuKPXAuNNiluseasT0QP+qyM+0EIMulsGRJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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