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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '81112a1214d212382e976dd6b12e88bc211a33ce8e6bb2787317fc69195f663c' 
  AND token = '687bE+xSEMYxiv0M3B5fVaHlDnZizxUrLuJcO1KxXrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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