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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '21c1e99740c1d451c87f6e0482f13fa0cbad6cbdca3fd8eef546de1f76be4f7f' 
  AND token = 'ffV3049Gd52ktjz0X6lPi/0EGabkslL5D6C81uLdVSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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