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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '59a066815c63671151f649007ece0ce3d9f94c10ca8abc2582f24b0733754d3a' 
  AND token = 'uwpOEWBqI3J0BkzO8EzKxq/53H63yqfsefpFE00whxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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