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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cd4696faa73ec93d4f9f3573573ebf9adc56a36c4bf015f0a8168c39ba0888fe' 
  AND token = 'mX0kMo/XHOkKWRXHfruhJq88DSpBvgWl43T5C7R35sM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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