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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b929239a78d7cba3eacbf3ebda03f4eb6a24f7666dd6d391e1d7cbffbdf6315f' 
  AND token = 'DqiDa9Ux9mO9sliLmHEIoX4gE/g3ySgLh10bS0IKKCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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