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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '361d78b10b8134c3baa1073c41983edf079cc75bef11a6ea8ae7e174abd25f7f' 
  AND token = 'nzbDTGVFjwlojxscgWZYhxBrxa32sAhMj9Z6VnI1Vs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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