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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b1c8a41c65da677c7ca77afa96e7c71c7b4c810e9515a052712b5a81a06376fd' 
  AND token = 'GDDjkBbtLNHxEpNlpbP971NoKTbo1NgNruIaKIKzcIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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