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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f2a3ed2758636099654da37278236fd382b0ef8401cd828378c17e1c0d453e0c' 
  AND token = 'daNflXJPPUaumA2EwgH4AYH6K2b1F+bQ21xsr8DwLvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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