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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '93b75b314107043d2cb061b0b762943397b9654676529ea6385db370323767fe' 
  AND token = 'EcpnlMWRy/QoiWrWi//kv8GbD2GUV5M4cbUanh4NzpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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