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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c9893ef2418cff5fc08e10acba296a285b6c93f301b1c46be483d222c0f0b773' 
  AND token = '7XA2Sv3Y8lq+4yht1H7/M0tZiXluMNvnKyQivcVKW1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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