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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4dc930fc37160ccc819cb8ef3d3ab9d79c831a5d665e1bc9d7ab10af7f7b2f1d' 
  AND token = '+GDqEucwBpIja0LL3nZnKGN3of5ZlU+y0eWbV3GU18g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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