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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8292253bbcf16c5c2f82bcc4bcc2d564c6bedc3ecea6c542e3269ab593aa5d4d' 
  AND token = 'VbtsrZuqyJpyX4sRb7HcZoN8DYaFLxdnkrQNJ6A1ifE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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