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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ff79f5526428a74c03692c696c834dfe0aa89e5143db9cb44fba94e7a4950e9a' 
  AND token = 'USTyuX/vv6pwEUckC7eaL+0aZJGytuMI0DBdMQ4L0Ug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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