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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '64d7c32df0073370cd687d03a762f38de516fd80e84b6fe5117d559e6359e6ab' 
  AND token = 'E/yHOX5YL1op4IKK4PkE128uNN+EFFQLlv/Q+tiOlmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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