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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '19c60eee26c9c24f60b5f88514d7e6c46d45ee12aaa7da21c6441f05ca231cd2' 
  AND token = 'x1pjSOdRcpzwLbauZYI7OwWkj32qyGiV8WjrDOTxrn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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