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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f1439e38cd97cc1a61f3c8df48a6a1ff315dadfdc57e3b1b738ed8a8a22479b9' 
  AND token = 'j1YdpyniKHOf33bEfNMJGVdIiZYmPXh/ZNGictS/RUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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