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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9f45add67aaf0a10d774f522b843a35ad7bfbe2d3a000f0ee5750d921147803f' 
  AND token = 'KZUtuYO7nRTMUxPR1SiXmrdDbcaJl79XLJ7GMLLAC0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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