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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd860abb8ee1210f9100c96491ab0f0ad48956931c22ffe4f0792e5ca18457d06' 
  AND token = 'ULWt6fIOsPdnMok/LPmxWJUVjRnfsM/i9Wfut8rhElk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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