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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '48ca21c810d9e821fb40ae2869332a53c0b233a3b6cfaf3d68a8899a37252aca' 
  AND token = '4K/fFzrkGhIOnPIwcS7DhaUF3qg5Y87Nxe8hn3jmT4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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