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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '27ebc74106eca7df54a6361a5fa561146cbcc23f950d53dd4dd63a03f5640f1c' 
  AND token = 'Li376xal/So8R7r3YwrXdhK+gKUhRpxh24Z97vvUJWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00262

JSON explain

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