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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '29e5d712935e58ad3f1e35658c44fb2d3b01e2c4c82e32c4c1666eced419bf59' 
  AND token = 'og1k/tNJIguhezOhlYL1hlc+Sq/vk1++5lDk+4MyF68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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