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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6df75a28b742deead22b7d1339e95c86002bf7880ed76c6efc09cbb9839504a3' 
  AND token = 'PkZkSbrjvut8V+N2Qe0WdNKMadqRg04mLttyBKp88cE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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