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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '42d0b2955461c6771447f9df84e7cdc905ce745f06cfeebe543477767512522d' 
  AND token = 'eSbgdj1rvd5YycWDR++sEl2EAuQ8CawMUC/ZLXnevs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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