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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9046a4c4984a1c6d2dacf9ccf8805badf6b4bf759f4de14c7394116353b077bf' 
  AND token = 'Bduf0iflsNx4Nxrws5Gm+dRDhi9V32P+G/lxrps5sgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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