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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ca0190bbcb14ace846a7a5593c4a283c5a3862f1c869f48e1378afb476510b6f' 
  AND token = '5I3WJ/e00gkOZX7UsU0R91HMtNCkgZQ4NOYCX6gyWew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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