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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '59cef65ea037c3e39b56e86e5853a43a827f3fbe85dc2f99c10426c7555ccbeb' 
  AND token = '0DGTiv2C1RLcYDwznv4f01/OnGLW7I4a8QSnQBfu60s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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