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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e52df249f8bd96c47c34f22ff281e575a90faa01afdb3d054d58c6b78a17e7f8' 
  AND token = 'axpB066TK/uWgfgWJEXpMpcaXql2h/7sOoz5RzW5roU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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