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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a9205c530df9d302cb68386a8a49b1b4667962bd19b5f60139fe8feeea75eb94' 
  AND token = '8jyI9Pxo0bdtISrYKrfsAtF3vdogGlKd5/ZHc7lX/Ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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