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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5067b68e88f11147f820313169c6c08f2881e75cd81ec7e3190710796ef81e64' 
  AND token = 'coFzIkXgLEWOhDoBvc2NDJgB32LUfC7fAQU4qd9fUII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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