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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd7b96db9c35e1df7646573a79cac53bbca5ea5b5cab38203e062b503cf377ea7' 
  AND token = '3iQeK0sjHLKFkZ9y7q6lwVtJW8LXz+L/k/osDmLq9ZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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