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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b469120342929575576ed59d31f7ab0c87ed8b22262b61ad08b2b2c5b0e8345' 
  AND token = 'v9Vpl3VpFdZIdppqSiuTT7J6On27bDWAe74NK0qcsGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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