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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ee2296505812df0e5e3c32107d27c9df3ac180a0ea96d3fbbae2ed09d43f0cbe' 
  AND token = 'q+i/aU1YXAtlFGptoLXB7HJ4MN4DdZ4a696R90oMOxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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