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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1c81f3782134b2b7da1b831cbbd80c030767423d5ad50c6997eb78d96c65eb46' 
  AND token = 'teBWTNYBXMTbN8G5T0swVGwc4N2CAVZs3mE0CZK7Fg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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