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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0930f47a9a23566fa93efafaf0d19831f28e54cdfd0976130e2f318a67138f31' 
  AND token = 'iqRSSNGHO1jzxIPI7eRLzsLcYD4TEfZmoMgTPgID0M4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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