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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '16cd37ad3858414287e85c0f744b68a8ad5ef284b43b63ce7d1112bac8c41888' 
  AND token = 'sFNU7uywUdlMgJ68vIcijyis5eSNz+urKcPh9YKcL4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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