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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '49dde68b907aaa7884b9ac551844c7c553b7843d61a9cbe91b8f42731f96e6cd' 
  AND token = 'lsWPSdNxLbkUefC75WvbGzcIcMvyAGgSccQmScYJCq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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