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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5d369908ac00d7b4857cd41a1d5fc012e85f5db0931b291ffaa125ddbcee7a03' 
  AND token = 'Kp0jdXGg3WuHTcyDp5Ny4KS1B4pBM7HwjpE5N9ZAuYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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