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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5267ecc5dab85217195702bea9eaa61eeecd9b216f51b628ab7714e27955b904' 
  AND token = 'KV6x+OI4OGiDrVMugeYtDX9UriNlsfWMAK4hEK3msss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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